321213647 has 2 divisors, whose sum is σ = 321213648. Its totient is φ = 321213646.

The previous prime is 321213643. The next prime is 321213671. The reversal of 321213647 is 746312123.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321213647 - 2² = 321213643 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321213643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160606823 + 160606824.

It is an arithmetic number, because the mean of its divisors is an integer number (160606824).

Almost surely, 2^321213647 is an apocalyptic number.

321213647 is a deficient number, since it is larger than the sum of its proper divisors (1).

321213647 is an equidigital number, since it uses as much as digits as its factorization.

321213647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 29.

The square root of 321213647 is about 17922.4341817734. The cubic root of 321213647 is about 684.8539991107.

The spelling of 321213647 in words is "three hundred twenty-one million, two hundred thirteen thousand, six hundred forty-seven".